linux-kernel - Re: [PATCH] sched/clock: prevent tracing recursion in sched_clock

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Message-ID: <531D66FE.20703@lab.ntt.co.jp>
Date:	Mon, 10 Mar 2014 16:17:18 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando_b1@....ntt.co.jp>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/clock: prevent tracing recursion in sched_clock_cpu()

On 03/06/2014 07:51 PM, Steven Rostedt wrote:
> On Thu, 06 Mar 2014 14:25:28 +0900
> Fernando Luis Vázquez Cao <fernando_b1@....ntt.co.jp> wrote:
>
>> From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
>>
>> Prevent tracing of preempt_disable/enable() in sched_clock_cpu().
>> When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are
>> traced and this causes trace_clock() users (and probably others) to
>> go into an infinite recursion. Systems with a stable sched_clock()
>> are not affected.
>>
>> This problem is similar to that fixed by upstream commit 95ef1e52922
>> ("KVM guest: prevent tracing recursion with kvmclock").
> Also similar to: 569d6557ab957.
>
> Acked-by: Steven Rostedt <rostedt@...dmis.org>

Thank you four your review, Peter, Steven.

By the way, who is going to pick this patch? Do you want
me to resend with Steven's Acked-by added?

- Fernando
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